Mishkat al-Masabih — Hadith #39083

Umm Salama said that in the time of God’s messenger there was a woman who had an issue of blood, so Umm Salama asked the Prophet to give a decision about her. He said, “She should consider the number of nights and days during which she used to menstruate each month before she was afflicted with this trouble and abandon prayer during that period each month; then when she finishes that she should wash, tie a cloth over her private parts and pray.” Malik, Abu Dawud and Darimi transmitted it, and Nasa’i transmitted something to the same effect;